Heating furnace



June 20, 1933. cna. .w\.:-LANGFoRD Elf AL 1,915,132

H EATINQFURNAGE INVENTORS fraz/r6 ATTO RNEYS June 20, 1933. G. w.LANGFORD Er A1.

HEATING FURNACE Filed March 50, 1951 2 Sheets-Sheet 2 ATTORNEYS PatentedJune 20, 1933 UNITED ls'ia'rlas PATENT 'OFFICE GEORGE W. LANGFORl) AND.ALFOBD C. IBLRROTFS, F ABBOB, MICHIGAN, .AS- SIGNOBS T0 EUONOIY BALBCOMPANY, 0F .ANN ABBOB, HICEIGAN, .A CORPORA- TION 0F MICHIGANApplication llled Iarch 80,

The invention relates to hot air furnaces and consists -in the novelconstructlon as hereinafter set forth.

In the drawings:

Figure 1 is a sectional elevation of the furnace withV the outer' jacketcut away;

another heating unit without 'detachment of the hotrair llues from thejacket.

Figure 5 is a section on line 5-5 of F 1gure, 2.

Figure 6 is a section through a, portion of the furnace showing thedeflector used 1n connection with a large jacket.

Among the objects of our invention are, first, to obtain a constructionparticularly adapted for use withk liquid fuel burners which willeffectively prevent any miXlng of the fuel vapor or products 1 ofcombustion with the air which is being heated. At the same time it isdesirable to have a construction which may be readily handled duringinstallation and which is capable of disassembly when necessary forrepairs. These results we have obtained by a construction having outerand inner units detachably secured to each other but in such a manner asto preclude any gas leakage through the joints.

Another object is to obtain a very high efficiency both by reason of theamount of heating surface that is exposed to the gaseous products ofcombustion and to the air to be warmed and also by the disposition ofthis surface to be most effective in the transfer of heat from the onemedium to the other. This result is obtained by the specificconstruction which is as follows:

A is the inner unit which has a cylindrical portion A forming thecombustion chamber and extending downward to the supporting base or thatwhich in a solid fuel furnace would constitute the ash pit section. Thiscylindrical portion is also provided with outwardly extendingdoor'opening casings B FUBN'AGE 1931. Serial No. 526,486.

and C which extend to a front plate D. A door E connecting with the caseC provides access to the interior of said unit A. Above the cylindricalportion A is an upwardly extending conical portion A2 which terminatesin an annular flange F for attachment to the outer section. This outersection G has at its upper end a central portion G resting upon theconical portion A2 and provide with a flange F for clamping the same tothe flange F.' Extending radially fromthis central portion G are iluesG2 which are substantiallyrectangular in horizontal section, but whichtaper outwardly as they extend downward so as to clear the conicalportion A2. The lower ends of the lues G2 are connected to a segmentalannular flue H which surrounds the portion A vof the section A and atthe center and to the rear has a nipple H for connecting with thechimney flue.

There is also a nipple G3 connecting to the upper end of one of the luesG2 forforming al direct draft connection with the chimney Each of thesections A and G is formed with welded joints so as to be gas tight, theonly detachable joint being between the flanges F and F which can besealed by a gasket. Consequently there is no opportunity for the gaseousfuel or products of combustion to escape from the furnace into the airchamber. To increase the elliciency, lins I extend radially outward fromthe inner section A and serve also to divide the rising air currentsfrom each other so as to avoid any obstructing eddies. 'A water tank Jis preferably placed in an aperture in the front D above the door 'Ewhere it will be in contact with the warmer air. filled by tilting itoutward while resting on the lower edge of the aperture and afterfillingthe weight of the water will hold it in pos1tion.

This tank may be j' out sucientlyior removal of the old furnace. The newfurnace may then be inserted therein and the jacket closed therearoundand attached to the front D.

With the construction as described in operation the cold' air enteringat the bottom of the jacket will rise vertically 'through the spacesbetween the `fins I coming in contact with the outer surface'of theinner section A and passing between the same and the segmental flue H.This segmental flue constricts the s ace within the jacket so that aportion of the ascending air passes between the same and the innersection as 'ust described and another portion passes tween the outersurface of the segmental flue and jacket.Y As soon, however as the airrises above the segmentalflue the volume of unobstructed space withinthe jacket is increased and the of the more highly heated air adjacentto the inner section will draw the cold air from adjacent to the outerwall of the jacket radially inward between the radially extending iiuesG. This'will insure a more thorou h and uniform heating of the risingair be ore it is delivered to the hot air iiues. Furthermore, theradially extending iiues provide a large amount of heating surface,'al1of which is-wiped by the ascending current of air Yto-obtain a higheiciency in heat transfer.

The construction of the section G with its center or hub portion G andradially extending fiues G is an important feature of the improvement.This permits of forming the outer and inner sections of separateunitswhich may be assembled witheach other and when attached will form arigid structure. At the same time provision is made for expension andcontraction under varyingtemperatures without any tendency to cause asnapping or other Vdisturbing noise. The joint between the flanges F andF Vcan be readily made gas tight and as all other joints are welded,there is no danger of escape of gas.

As has been stated, the upper end of one of the ilues G2 has a nipple Gwhich is connected through a horizontal flue -Gt with the chimney pipeHz leading from the nipple H. In the flue Gis a damper K which isautomatically operated by a thermostatic connection L. The arrangementis such that when the furnace is cold as in starting, the damper K willbe opened so' as to afford .a direct draft without requiring theproducts of combustion to pass downward through-the flues G2 andsegmental flue H. As soon, however, as the furnace is heated -thethermostatic connection L-'will operate to close the damper K compellingthe products to pass by way of the flues G and H to the furnace pipe H2.

The doors E and E which normally close the door openings B and C restagainst in-A clined sheets and are hinged at the tOp S0 3S vity. If,however,

prpved construction, the old jacket may be v utilized as has beenpreviously described.

Inasmuch, however, as jackets of different furnaces vary considerably indiameter, we have provided means for adjusting our unit to connect 'withthe same. Thus as shown, the front plate D is provided at its side edgeswith outwardly extending lianges D and to these flanges angle bars M aresecured by bolts M g through slots M. This permits o adjusting the.angle bars M radially outward or inward so as to lit-the particulardiameter of jacket. .At the top there is anbutwardly extending flange Dto which is secured'a Vsegmental angle bar N Afor completing theattachment to the'upper end of the jacket. Where jackets are ofdifferent fines-G2 only, we have arranged a bamev H3 within thesegmentalilue H and at the 'frear side thereof. This will compel thegases passing downward through the rear ilues Gz to travel forward abovethe bafHe H' and then join the gases descending through the forwardiiues Gz to pass under the baille to the nipple H. Y

The furnace may'be readily cleaned by the introduction of a brush throunipple H when the chimney plpe H* is removed. To avoid the obstructionof the bafile H an aperture is cut therein adjacent to the nipple Hwhich is closed by 'a removable plate H. Thus in cleaning the rear ue Gzthe plate H is 'first removed which permits of introduction of the brushthrough the aperture to find access to said fines.

Where the furnace is used as a replacement This may be accomplished asshown in Figure 6 in which a segmental inclined deector R is secured atits lower end to the jacket 'and directs the ascending air currentinward into proximity to the heating surface.

What we claim as our invention is:

1. A hot air heating furnace comprising a central cylindrical sectionforming the combustion chamber provided with a conical upward extension,asection mounted on said central section having a center or hub portionattached to the upper end of said conical extension, and flues.radiating from said hub portion and extending downwardly therefrom, saidiues tapering outwardly in a the rear downward direction, and asegmental Hue connected at the lower ends of the radial Hues andprovided with a chimney connection.

2. A hot air heating furnace formed of a plurality of sections, one ofsaid sections havlng a cylindrical portion forming the combustionchamber with an upwardly extending conical portion, another of saidsections having a central or hub portion attached to the upper end ofsaid conical section, a series o f Hues extending radially anddownwardlyfrom said hub portion, and a segmental Hue connected to the lower endsof said downwardly extending Hues and surrounding the cylindricalportion of the first section, said segmental Hue being provided with anipple forming a chimney Hue connection.

3. A hot air furnace comprising a plurality of sections, the i-nnersection being formed with a cylindrical portion for enclosing thecombustion chamber and a conical upward extension thereof terminating ina Hange, another section comprising a centr-al or hub portion Hanged tobe secured to the Hange of said conical portion, a series of radiallyoutward and downwardly extending Hues connected to said hub section,said Hues tapering outwardly to provide clearance between the same andsaid conical section, and a segmental Hue connecting to the lower endsof said radial Hues, said inner section being provided with verticallyand radially extendmg fins for the purpose described.

4. A hot air furnace comprising a plurality of scctionsthe inner sectionbeing formed with a cylindrical portion for enclosing the combustionchamber and -a conical upward extension thereof, another sectioncomprising a central or hub portion having attachment to the upper endof said conical portion and also having a series of radially outward anddownwardly extending Hues, and a segmental Hue connected to the lowerends of said downwardly extending Hues forming an obstruction betweenthe inner section and the outer jacket whereby a portion of theascending air will pass between said segmental Hue and inner section andanother portion will pass outside said Hue and then radially inward inthe pockets between 'said radially extending Hues and in wiping contactwith the surfaces thereof. Y

5. A hot air furnace comprising a plurality of sections. the innersection being formed with a cylindrical portion for enclosing acombustion chamber and conical upward extension, an outer sectioncomprising a central or hub portion connected to the upper end of saidconical portion and a series of radially outward and downwardlyext-ending Hues connected to said hub section, a segmental Hue connectedto the lower ends of said downwardly extending Hues and extending aroundthe furnace from opposite sides of the front, a chimney pipe connectedcentrally to said segmental Hue and a horizontally extending baHie orpartition in said se mental Hue for compelling the gaseous pro uctsdescending through the rear downwardly extending Hues to pass forward,said baille being apertured adjacent to the chimney pipe connection topermit of cleaning the ues and a detachable plate for Icovering saidaperture.

6. In a hot air heating furnace, a heating unit adapted for replacementuse, said unit being provided with a front connected thereto and with adoor opening casing extendin from said front inward to the unit anflanges connected to said` front and an le bars radially adjustablysecured thereto or attaching the same to jackets of different diameters.

7. In a. hot air heating furnace, a heating unit adapted for replacementuse, said unit being provided with a front connected thereto and withdoor opening casings extending from said front inward to the unit,outwardly extending Hanges on opposite sides of said front and anglebars secured to said Hanges and radially adjustable thereon to beengageable with jackets of different diameters.

8.- In a hot air heating furnace, a heating unit adapted for relpacementuse, said unit being provided with a front connected thereto and withdoor opening frames extending from said front inward to the unit and anoutwardly extending Hange at the top of said front and an exchangeablesegmental Hange for connecting the top Hange of said front with thejacket and of a curvature corresponding thereto.

9. A hot air furnace comprising a plurality of sections, the innersection being formed with a cylindrical portion and a conical upwardextension thereof, an outer section having a hub portion for connectingwith said conical extension and a series of radially outwardly anddownwardly extending Hues, a segmental Hue connected to the lower end ofsaid downwardly extending Hues and providing a chimney Hue connection,and a series of radial Hns connecting to said inner section andextending outward in the space between the same and said segmental Hue,said Hns dividing the space surrounding the inner section intoseparatevertically extending air channels for the purpose described. Y

10. A hot air furnace comprising a plurality of sections, the innersection being formed of a cylindrical portion for enclosing a combustionchamber and a. conical upward extension thereof, the outer sectioncomprising a central or hub portion for engaging said conical extension,a series of radially outward and downwardly extending Hues and asegmental Hue connecting the lower ends of said downwardly extendingHues and providing a chimney Hue connection, a

b -pass ue between the upper end ef one o; -said radially extending uesand the chimney flue and a thermostatically controlled damper in saidby-pass flue' adapted 5, to o n the same when the furnace is cold and-to c ose when heated.

In testimony wherepf we ax our signa,-

tures.

GEORGE W. LANGrIBORD.V

-10 ALFORD C. BARROWS.

